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Measurement of Spatial Stability in Precision Grip
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Does postural stability affect grasping?

Dimitris Voudouris1, Saritha Radhakrishnan, Vassilia Hatzitaki

  • 1Research Institute MOVE, Faculty of Human Movement Sciences, VU University, Amsterdam, The Netherlands. d.voudouris@vu.nl

Gait & Posture
|February 14, 2013
PubMed
Summary
This summary is machine-generated.

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Challenging upright stance, like standing on foam, reduced body sway during grasping. Posture adjustments were less pronounced, yet hand and wrist movements remained consistent for successful object grasping.

Area of Science:

  • Biomechanics
  • Motor Control
  • Human Posture

Background:

  • Maintaining balance during voluntary movements is crucial.
  • Upright stance stability can be challenged by unstable surfaces.
  • Grasping tasks require coordinated limb and body movements.

Purpose of the Study:

  • To investigate how unstable stance affects the execution of a reaching and grasping task.
  • To determine if postural control strategies change during grasping on a stable versus unstable surface.

Main Methods:

  • Participants performed a reaching and grasping task while standing on a stable surface and on foam (unstable surface).
  • Body sway and center of pressure (COP) were measured during quiet stance and task execution.
  • Kinematics of reaching and grasping movements were analyzed.
Keywords:
Dual-taskGraspingInstabilityPosture

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Main Results:

  • Standing on foam increased body sway and center of pressure fluctuations before reaching.
  • During the reaching task, participants exhibited less overall body posture change on foam compared to the stable surface.
  • Hand and wrist movements for grasping were unaffected by the stance condition.

Conclusions:

  • Unstable stance alters postural control strategies, leading to more constrained body posture adjustments during grasping.
  • The central nervous system compensates for postural challenges by utilizing movement redundancy to maintain task-specific hand and wrist kinematics.
  • This suggests adaptable motor control mechanisms that prioritize goal-directed movements under perturbed conditions.